What importance do fossils have to scientists

Which is one example of a phenotypic change that is not genetic

Qué sucede cuando una persona tiene muy poco o demasiado costeroides?

Internal feedback works to maintain homeostasis when your a. heart rate decreases as your white blood cells increase b. breathing rate decreases as your red blood cells decrease c. heart rate increases as your liver is cleaning blood d. breathing rate increases as your heart rate increases